Closeup (1×1 cm) of sand from the Gobi Desert, Mongolia. Sand is a naturally occurring granular material composed of finely divided rock and mineral particles. It is defined by size, being finer than gravel and coarser than silt.
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On the Mohs scale, a penny is about 3, glass is about 5 and the nail is about 5 5 1/2. Therefore, if the rock scratches the penny it is greater than 3 in hardness. If it scratches the glass it is greater than 5 in hardness. Alternatively, if the nail scratches the rock, the rock is less than 5 in hardness. 5.
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The Mohs' hardness scale was developed in 1822 by Frederich Mohs. This scale is a chart of relative hardness of the various minerals (1 softest to 10 hardest).